Corpus iuris canonici emendatum et notis illustratum: Gregorii XIII. pont. max. iussu editum. Indicibus variis et nouis,
Lancellotti, Giovanni Paolo,1522-1590.
Lugduni,
1606.
Each pt. has separate title-page.
Gratian, active 12th century.
Catholic Church. Pope (1572-1585 : Gregory XIII)
Catholic Church. Pope (1227-1241 : Gregory IX)
Canon law.